Receiver for wireless charging system

ABSTRACT

A receiver for a wireless charging system, capable of receiving power energy using non-contact type magnetic induction, includes a coil capable of receiving the power energy and a part for generating a predetermined output power from the power energy received by the coil, a portable terminal, an NFC coil further provided outside of the coil, and a ferrite sheet further provided at the coil and the NFC coil.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of prior application Ser.No. 16/588,092, filed on Sep. 30, 2019, which is a continuation of U.S.patent application Ser. No. 16/364,371, filed on Mar. 26, 2019 andissued as U.S. Pat. No. 10,491,049 on Nov. 26, 2019, which is acontinuation of U.S. patent application Ser. No. 16/036,082, filed onJul. 16, 2018 and issued as U.S. Pat. No. 10,284,023 on May 7, 2019,which is a continuation of U.S. patent application Ser. No. 15/478,582,filed on Apr. 4, 2017 and issued as U.S. Pat. No. 10,050,478 on Aug. 14,2018, which is a continuation of U.S. patent application Ser. No.15/201,915, filed on Jul. 5, 2016 and issued as U.S. Pat. No. 9,653,942on May 16, 2017, which is a continuation of U.S. patent application Ser.No. 14/369,350, filed on Jun. 27, 2014 and issued as U.S. Pat. No.9,413,191 on Aug. 9, 2016, which claims priority to PCT/KR2013/000147,filed on Jan. 9, 2013, which claims priority to Korean PatentApplication Nos. 10-2012-0086193, filed on Aug. 7, 2012,10-2012-0048052, filed on May 7, 2012, and 10-2012-0002291, filed onJan. 9, 2012, and all the benefits accruing therefrom under 35 U.S.C. §119, the contents of which are incorporated by reference herein in itsentirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a wireless charger, and morespecifically, to a receiver for a wireless charging system, whichprovides a new design structure for efficiently receiving powerwirelessly transmitted from the wireless charger.

Background of the Related Art

Techniques of providing wireless transmission and reception units in anelectronic device and accomplishing wirelessly charge are underdevelopment. Mobile communication terminals are developed in a varietyof forms recently, and therefore, there are charging jacks as diverse asvarious forms of power chargers. Although a problem of compatibilitybetween the chargers arises accordingly, since the charging jacks arestandardized to a 24-pin charging jack, the problem of compatibilitybetween the chargers has been solved for users.

However, since charging is still accomplished through a long cable wiredbetween a charger and a device, users considerably suffer from troublesand inconvenience due to the limitation on distance. In addition, when aplurality of terminals is charged using one charger, there is a problemin that the users can be troubled due to manual attachment anddetachment of the charger and the terminal jack or the terminal can bedamaged due to abrasion or damages of a connection part.

However, since the specification and shape of a terminal are differentamong devices in a connection terminal type, users suffer fromdifficulties of repeatedly purchasing a new charging device, and thismethod generates a new problem of discarding previously used chargerswhen a new device is purchased.

In addition, a non-contact type magnetic induction method, i.e., awireless charging method, has been devised to solve the above problems.The non-contact type charging method is a method of providing current ofa charging parent, i.e., energy, to the battery of a portable electronicdevice through inductive coupling, by configuring a primary circuitoperating at a high frequency in the charging parent and configuring asecondary circuit at the battery side, i.e., in a portable electronicdevice or the battery. The non-contact type charging method using theinductive coupling is already used in some application fields (e.g., anelectric toothbrush, an electric shaver and the like).

However, when the non-contact type charging method is desired to beapplied to a portable electronic device, such as a cellular phone, aportable MP3 player, a CD player, an MD player, a cassette tape player,a notebook computer, a PDA or the like, variation of charging efficiencygenerated according to the position of placing the portable electronicdevice or the battery should be improved, in addition to the requiredcondition of reducing the volume and weight which will be added to thebattery.

However, when the non-contact type charging method is applied to acellular phone or a smart phone, needless to say that the variationshould be improved, there is a problem in that since various types ofwireless chargers are released in a predetermined method, the wirelesschargers cannot charge a battery if the charging methods are different.

Furthermore, the non-contact type charging method provides only onecoil, and a design specification between coils is not determined, and,in addition, an accurate structure of placing a coil in a terminal isnot described.

That is, in prior art 1 (Korean Patent Registration No. 10-0928439), alower core is provided to be placed between a first upper core (coil)and a second upper core, and a control unit determines which of thelower core, the first upper core and the second upper core receives asignal transmitted from a non-contact point power reception apparatusand controls transmission of a power signal through a corresponding corein correspondence to a result of the determination. However, a coil(antenna) having a composite function is not presented, and an optimaldesign condition or structure is not presented.

In addition, in prior art 2 (Korean Patent Registration No. 10-0971714),the inductive pattern core of the primary core unit is provided with alower core layer having a plurality of cores formed on the top of a PCBbase and an upper core layer having a plurality of cores formed on thetop of a gap panel on the lower core layer, and although the lower corelayer and the upper core layer are positioned to intersect with eachother to be provided as multiple layers, a structure of a core (antenna)having a composite function is not presented, and an optimum designcondition is not specifically presented.

In addition, although prior art 3 (Korean Patent Registration No.10-1001262) provides a rechargeable cellular phone case including asupport for detachably resting a portable terminal; and a chargingmodule provided in the support to accomplish wireless charge when theportable terminal is rested on the support as the magnetic fieldsgenerated by the power supplied from outside are transferred to theportable terminal side by electromagnetic induction, it also does notpresent a structure of a core (antenna) having a composite function anddoes not specifically present an optimum design condition.

Accordingly, it is necessary to develop a wireless charging methodhaving both a composite function and an optimum design condition.

DISCLOSURE Technical Problem

Therefore, the present invention has been made in view of the aboveproblems, and it is an object of the present invention to provide adesign structure of a wireless power reception unit in order toeffectively receive power transmitted from a wireless power transmissionunit in a wireless charging system, and specifically, to provide a newshape of a coil and a structure of selecting and designing the coil.

Technical Solution

To accomplish the above object, according to one aspect of the presentinvention, in a receiver for a wireless charging system capable ofreceiving power energy using non-contact type magnetic induction, whenthe receiver for a wireless charging system is provided with a coil 52capable of receiving the power energy and a part for generating apredetermined output power from the power energy received by the coil,the receiver for a wireless charging system is provided in a portableterminal 60, and an NFC coil 51 is further provided outside of the coil,and a ferrite sheet 59 is further provided at the coil and the NFC coil.

The NFC coil and the coil are spaced apart from each other, and a spaceddistance is between 1 to 10 mm. The part includes a control unit 10 forcontrolling reception of wireless power, and when the portable terminalis provided with a main CPU 110 for controlling the portable terminal,the main CPU controls the wireless charge receiver.

When a battery is embedded in the portable terminal, the coil isprovided on a surface of the battery embedded in the portable terminal,and a part 55 a of the wireless charge receiver is provided on a sidesurface of the battery.

In addition, a PCB substrate 55 provided with the part and a substrate50 provided with the coil are separated and bent in two pieces, and thepart is provided on the side surface of the battery and the substrate 50of the coil is provided on the surface of the battery, and the substrate55 provided with the part and the substrate 50 provided with the coilare connected to each other using a flexible connection line 57.

On the other hand, when the part 55 a is provided on the side surface ofthe battery, the part exists between the substrate 50 and the sidesurface of the battery, and the coil is provided in a lower case 61 ofthe portable terminal.

In addition, the coil is provided in the lower case of the portableterminal in a method of attaching the coil to the lower case 61 andattaching a film 62 thereon, and a circuit path of data received throughthe NFC coil and a circuit path for transferring the power energyreceived through a wireless power reception coil are separated from eachother, and the two coils are separated in terms of circuit.

At this point, if wireless power energy is received through the coil,power of the NFC coil is turned off.

In another embodiment of the present invention, a ferrite sheet providedat the coil and the NFC coil is integrated in one piece. Then, a spaceis constructed by forming a groove on the ferrite sheet, and the coiland the NFC coil are provided in the space, and the coil and the NFCcoil are provided on a surface of the ferrite sheet, and the ferritesheet is also provided between the coil and the NFC coil.

In addition, the ferrite sheet is made of manganese or zinc, and theferrite sheet is made of manganese oxide, zinc oxide or iron oxide, andwhether or not a wireless charger and an NFC are used is displayed on adisplay screen of the portable terminal.

Meanwhile, the coil is two or more overlapped coils, and when the coilis provided on a surface of a battery, an area where the coil isprovided is 40 to 90% of an area of the surface of the battery, and whenthe coil is provided on a surface of a case, an area where the coil isprovided is 40 to 90% of an area of the surface of the case.

In addition, the ferrite sheet and the coil are manufactured as a filmand attached to a battery or a case, and the coil is provided on aninner surface of a case and attached using a protection film or the coilis provided on an outer surface of a case and attached using aprotection film.

In addition, the coil is provided inside a case, the coil is provided ona surface of a battery and a protection film is provided on the coil,and two or more types of coils respectively having a differentcharacteristic may be provided, and an NFC module for controlling theNFC coil and an MCU for controlling the coil are separately provided,and a main CPU of the portable terminal controls the NFC module and theMCU or the main CPU of the portable terminal directly controls the NFCcoil and the coil.

Advantageous Effects

According to aspects of the present invention, the shape of a coil inthe reception unit is effectively designed in a wireless power systemand, additionally, a structure capable of enhancing efficiency ofmagnetic fields of the reception unit is provided, such that a receptionunit for a wireless power system may selectively receive wireless poweraccording to the state of a wireless power transmission unit and obtainan effect of enhancing reception efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing a reception unit of a wirelesscharging system of the present invention.

FIG. 2 is a view showing another embodiment of a charging method.

FIGS. 3 and 4 are views showing coils of the present invention indetail.

FIGS. 5 to 7 are views showing embodiments of arranging multiple coils.

FIG. 8 is a view illustrating the principle of a wireless charger.

FIGS. 9 and 10 are flowcharts illustrating the present invention.

FIGS. 11 to 17 are views showing embodiments describing a one chipconstruction method and the configurations of block diagrams.

FIGS. 18 to 23 are views showing embodiments of providing a receptionunit on the surface of a battery.

FIGS. 24 to 27 are views showing an embodiment of attaching a receptionunit on the side surface of a battery travel charger.

FIGS. 28 to 31 are views showing embodiments of forming a loop coilinside the case of a device.

FIG. 32 is a view showing a domain where a loop coil is formed in alower case.

FIGS. 33 to 37 are views showing arrangements of a wireless powerreception coil 52 and an NFC coil 51.

FIGS. 38 to 40 are views showing embodiments describing controls betweencoils.

FIGS. 41 to 44 are views showing embodiments of providing a ferritesheet.

FIG. 45 is a view showing an embodiment of a structure directly formingcoils on a ferrite sheet.

FIGS. 46 to 49 are views showing other embodiments of providing coils.

BEST MODE FOR CARRYING OUT INVENTION

A design structure of a wireless power transmission and reception unitis provided in order to effectively transmit and receive wireless powerin a wireless charging system, and a feasible structure for enhancingthe efficiency of transmitting and receiving wireless power energy isprovided.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereafter, a design structure of a reception unit for a wirelesscharging system according to an embodiment of the present invention willbe described in detail.

Embodiment 1

FIG. 1 is a block diagram showing a reception unit of a wirelesscharging system of the present invention.

Generally, a wireless charging system is configured of a transmissionunit for transmitting power energy and a reception unit for receivingthe power energy, and the transmission unit periodically drives a sensorto sense a predetermined signal and determines whether or not a chargerequest signal is sensed. When a charge request signal is sensed, apower transmission unit of the transmission unit is turned on. Then, thetransmission unit confirms battery voltage of the receiving side througha signal of the reception unit, and if a charge enable state isconfirmed, transmission of power is performed.

At this point, if the wireless charging system enters into the abovestate, the reception unit receives the power energy, and power ischarged into the battery of the reception unit. That is, the blockdiagram of FIG. 1 shows an effective design structure of the receptionunit provided to effectively construct such a general wireless chargingsystem.

There is provided an antenna loop coil substrate 50 for primarilyreceiving wireless power, and multiple coils are especially provided inthe present invention. That is, a WPC (wireless power consortium) typecoil 52, a KTP type (developed by a company of inventors, kthepower)coil 53 and an antenna coil 51 used for near field communication (NFC),which is a short range communication, are provided on the loop coilsubstrate 50 of the present invention. In addition, the coils 51, 52 and53 are provided on one substrate.

At this point, as shown in the figure, the antenna coil 51 used for NFCis provided at the outermost side.

In addition, in the above descriptions, there are provided a ZigBee 11which is a communication module for transmitting and receiving signalswith the transmission and reception unit, a control unit 10 forcontrolling each of signals and parts using a predetermined program, anda converter 12 for adjusting voltage or power to be finally fit for thevoltage of a battery of a cellular phone 60 or the like. At this point,the converter 12 may perform a function of increasing or decreasing thevoltage according to a situation and may also increase or decrease theenergy.

In addition, another characteristic of the present invention isproviding a WPC matching part 14 and a KTP matching part 15. That is, inthe present invention, there are a WPC type coil 52 and a KTP type coil53, and the matching part 14 or 15 functions to receive power energy byselecting either of the two types.

That is, since inductance of each coil is different, the matching part14 or 15 matches inductance of the coil to the communication part.

FIG. 2 is a view showing another embodiment of a charging method.

A charging controller 17 may be provided between the converter 12 andthe battery 70 in order to directly charge the battery 70. At thispoint, the charging controller may be provided in the form of a chargingintegrated circuit (IC). It may be referred to as a so-called chargingmanagement controller, and it is apparent that a variety of methods suchas a pulse method, a linear method, a switch method and the like may beapplied.

FIGS. 3 and 4 are views showing coils of the present invention indetail.

Although the substrate is not shown in the figure, it is apparent thatmultiple coils are provided on a flexible resin substrate or a generalsubstrate (e.g., a plastic or metallic substrate). In addition, as shownin FIG. 3, the NFC coil 51 is provided at the outermost side to be thelargest coil, and the WPC coil 52 and the KTP coil 53 are providedinside thereof.

At this point, the KTP coil 53 is formed of two coils (an inner coil andan outer coil), and the WPC coil 52 is formed between the two coils. Inaddition, like the shapes of the coils shown in the figure, the WPC coil52 is provided in the form of a spiral coil by directly winding a coilof an electrical wire style such as copper, and the KTP coil 53 and theNFC coil are provided in the form of a thin film (a coil of a thin filmstyle formed through an etching process after deposition or printcoating) on the substrate.

Accordingly, a substrate in the present invention may be a basesubstrate (a PCB or a substrate of metal or resin) for forming a loopcoil by coating or a substrate only for supporting a loop coil. At thispoint, it is apparent that the substrate for supporting a loop coil maybe a substrate of simple meaning for fixing a spiral coil on a plate (ahard or flexible plate made of metal or resin). That is, it may be aform of attaching a spiral coil on a substrate using a tape or anadhesive.

Meanwhile, in still another embodiment of the present invention, thereis provided a method of providing a coil in another part.

FIG. 4 is a view showing still another embodiment of different kinds ofcoils.

For example, if an inductance value of the KTP type coil is 3 μH and aninductance value of the WPC type coil is 9 μH, the number of turns ofeach corresponding coil will be different. Accordingly, as shown in thefigure, the WPC coil is used by connecting lead wires 52 a and 52 b atboth ends of the coil 52, and the KTP coil is used by connecting leadwires 52 c and 52 b at the middle and one end of the coil 52. Inaddition, the WPC lead wires 52 a and 52 b are connected to the WPCmatching part 14, and the KTP lead wires 52 b and 52 c are connected tothe KTP matching part 15.

Then, wireless power energy is received through the coil connected to alead wire which is connected to a matching part selected by the controlunit 10.

FIGS. 5 to 7 are views showing embodiments of arranging multiple coils.

FIG. 5 is a view of an embodiment showing a state of two overlappedcoils. That is, in the wireless charging system, coils of differentcharging methods are provided in a coil set (e.g., if a B type chargingcoil is wound inside or outside of an A type charging coil or a leadwire is provided in the middle of a coil and a different charging methodcan be selected, these coils are referred to as a coil set).

In addition, it shows a case of overlapping two coil sets.

FIG. 6 is a view of an embodiment showing a case of overlapping threecoil sets, and FIG. 7 is a view showing an embodiment of two or morecoil sets that are not overlapped.

As shown in the figures, when multiple coils are provided regardlesswhether or not the coils are overlapped, the coils sets may be appliedas a transmission unit coil or a reception unit coil.

Embodiment 2

FIG. 8 is a view illustrating the principle of a wireless charger.

FIG. 8 shows a general structure of a wireless charger for supplyingpower energy. First, a reception unit 200 has a structure of connectingthe antenna loop coils 52 and 53 to a condenser C in series, and atransmission unit 300 also has a structure of connecting an antenna loopcoil 31 to a condenser C in parallel. The only difference is that thetransmission unit 300 is further provided with a resonance filter, andthe resonance filter is configured as a structure of connecting the coil62 and the condenser C in series. At this point, it is apparent that theseries and parallel connections of the loop coils and the condensers canbe changed.

A method generally used in a wireless charger is a wireless powerconsortium (WPC) method, and the WPC method generally has followingconditions in order to transfer wireless power energy.

“Voltage: 7 to 15V (in the case of the reception unit), Frequency: 100to 200 kHz, Current: 5V (0.7 A), Power: 3.5 W, Inductance value of coil:8 to 12 micro Henry”

Meanwhile, the coil and the condenser have a structure of beingconnected in series. When the wireless power energy is transferred, theantenna loop coils 52 and 53 are used as a medium, and the antenna loopcoils 52 are 53 have a structure of being connected to the condenser inseries.

Meanwhile, the KTP method developed by the company of the inventors hasthe following characteristics.

“Voltage: 7 to 24V (in the case of the reception unit), Frequency: 1 to6.78 kHz, Current: 5V (1 A), Power: 5 W, Inductance value of coil: 600nH (nano Henry) to 2 micro Henry”

At this point, it does not mean that the voltage and current valuesshown above are exactly matched to the numbers shown above, andapparently, they show only a range.

Anyway, the biggest difference between the WPC method and the KTP methodis a difference in an inductance value and in a frequency value of thecoil. First, a reference value of the frequency difference may be set to1 MHz. That is, the WPC method has a low frequency lower than 1 MHz, andthe KTP method has a high frequency higher than 1 MHz.

However, as actually used frequencies, the WPC method uses a frequencyof 100 to 200 KHz, and the KTP method uses a high frequency higher than6 to 8 MHz.

In addition, as an inductance value of the coil, the WPC method uses “8to 12 micro Henry”, and the KTP method uses “600 nano Henry to 2 microHenry”.

The KTP method having the above characteristics is highly advantageous.For example, since even a part for generating a frequency uses a highfrequency, the part can be miniaturized (a high frequency generallyreduces the size of a part), and by reducing the inductance value of thecoil, a coil formed by printing on a PCB substrate (or a resinsubstrate) may be used instead of a spiral coil.

Since coils are formed on a substrate, it is advantageous in massproduction and has an effect of reducing a unit price. In addition, thenumber of turns of a coil (the number of windings) exceeds 50 times inthe WPC method, but the KTP method may reduce the number of turns to beless than 50.

Meanwhile, the number of turns is a number mentioned based on acriterion applied to a cellular phone. It is a number generallycalculated for a general cellular phone having an area less than 100square centimeters in maximum.

Embodiment 3

FIGS. 9 and 10 are flowcharts illustrating the present invention.

First, FIG. 9 will be described. A wireless charging system isconfigured of a transmission unit for transmitting power energy and areception unit for receiving the power energy. If the reception unittransmits a signal requesting transmission of power energy to thetransmission unit, the transmission unit which periodically drives asensor to receive a predetermined signal receives a charge requestsignal and transmits a charging signal to the reception unit. That is,the signal received by the reception unit through a near fieldcommunication module 16 in this general procedure is transmitted to thecontrol unit 10, and the control unit 10 exchanges signals with thetransmission unit in a predetermined method (steps 150 and 152).

Then, after exchanging the communication signals with each other in apredetermined method, the reception unit receives power energy (step153). At this point, the present invention provides a design structurecapable of receiving power energy of different methods.

That is, if the charging method of the transmission unit can bedistinguished based on the near field communication signal, acorresponding matching part is selected and activated, and a coilconnected to the patching part is activated as a result (steps 154 and160).

As a result, the power energy is received through an antenna loop coilconnected to the matching part selected by the control unit 10.

That is, the near field communication signal may include a signal foridentifying a charging method, and if the charging method is identified,a corresponding matching part can be immediately selected. Here,selecting a corresponding matching part is the same as the descriptionof the block diagram of FIG. 1. (It means that the process may directlyproceed from step 154 to step 160 in FIG. 6.)

Meanwhile, if a charging method cannot be selected through the nearfield communication signal, the charging method can be selected byanalyzing a value of magnitude of the wireless power energy transmittedfrom the transmission unit (steps 156 and 158). As is described in FIG.8, the WPC method and the KTP method respectively have a differentvoltage, frequency, impedance or inductance value, and a charging methodis identified by analyzing these values. In addition, the chargingmethod is identified by the control unit 10 in a predetermined way.Then, if the charging method is identified, a corresponding matchingpart is selected (step 160).

The reason why the control unit 10 may identify a charging method isthat the characteristic values of each method are previously stored inthe control unit 10 or memory (although it is not separately mentionedin the present invention, it is apparent that a memory device isprovided to perform a predetermined algorithm), and a charging method isidentified based on the stored values.

If a corresponding matching part is selected and activated, acorresponding coil is also activated, and the wireless power energy isreceived (steps 162 and 164). If the wireless power energy is receivedthrough the antenna coil 52 or 53, the converter 12 is controlled by thecontrol unit 10 to generate 5V voltage that can be finally charged inthe battery, and thus the battery is charged (step 166).

That is, the control unit 10 determines a conversion ratio of theconverter based on a selected method, and the converter converts andfinally outputs a voltage or power in proportion to the ratio (step168).

At this point, the flowchart of FIG. 9 provides a method of receivingpower energy transmitted in two methods by the transmission unit in thewireless charging system. That is, if the power energy is transmitted ina method among the two determined methods, the reception unit selects amethod capable of receiving the transmitted power energy and receivesthe power energy.

However, when the reception unit selects a method capable of receivingthe transmitted power energy, it is not that the method should beselected only from the two methods. That is, if a method can beidentified and selected based on the inductance, impedance, voltage,frequency, near field communication symbol or the like of a coil, andthe power energy can be transmitted by selecting one of three or morepower energy transmission methods, the reception unit may select areception method and receive the power energy in the end.

For example, there may be other methods in addition to the WPC methodand the KTP method, and the transmission unit may transmit the powerenergy in a method other than the two methods. Even in this case, amethod of transmitting the power energy is also determined based on theinductance, impedance, voltage, frequency, communication symbol or thelike of a coil, the reception unit may select a corresponding method andreceive the power energy.

FIG. 10 is a view showing another embodiment of selecting a chargingmethod by analyzing a state.

If wireless charging is started, power energy is transmitted andreceived (steps 100 and 102).

If a charging method of a switch or menu type is manually selected, acorresponding antenna coil may be selected (steps 104 and 110) (since ageneral method may be used as a selection method, a separate descriptionof the manual selection method will be omitted in the presentinvention).

If a charging method is automatically selected, the charging signal ofthe reception coil 52 or 51 is analyzed. The voltage, frequency orimpedance may be analyzed. In addition, a corresponding coil is selectedaccording to the analyzed value (steps 104 to 110).

In addition, the coil is allowed to have a value corresponding to theanalyzed voltage, frequency or impedance value (step 112). For example,if a charging method is selected by analyzing the frequency value, thecoil of the reception unit has a frequency value of the selected method.

If a charging method is selected as described above, transmission andreception of wireless power energy occurs, and the battery is charged.

Embodiment 4

FIGS. 11 to 17 are views showing embodiments describing a one chipconstruction method and the configurations of block diagrams.

Constructing parts as one chip may be an important means to simplify theparts and reduce the manufacturing cost, and FIG. 11 is a view showingthe parts which can be constructed as one chip in one block 100.

That is, a control unit 10, a communication module (ZigBee), a converter12, matching parts 14 and 15 and a communication part 13 may beconstructed in one chip to be configured as one part.

Meanwhile, each of the parts may be configured so as to receive wirelesspower energy while a battery is embedded in a cellular phone or anelectronic device when the wireless power energy is received. In thiscase, a part of the cellular phone or a main CPU 110 of the electronicdevice may function as the control unit 10 of the reception unit inorder to reduce the cost of the parts.

In addition, FIG. 12 is a view showing an embodiment of this case. Atthis point, in the case where the parts of the reception units areconstructed as one chip, the communication module (ZigBee), theconverter 12, the matching parts 14 and 15 and the communication partexcept the control unit 10 may be constructed in one chip to beconfigured as one part.

In addition, FIG. 13 is a view showing an embodiment of minimizing theparts of the reception unit by mounting all the parts other than theantenna loop coil 50 and the antenna chip 6 in a cellular phone or anelectronic device. FIG. 14 is a view showing a case where the main CPU110 of the cellular phone or the electronic device performs the functionof the control unit 10 of the reception unit.

In the present invention, constructing parts as one part or one chip maymean integration of the parts. It means that the parts may be configuredas an integrated circuit (IC) through the integration or manufactured asone part through micro electro mechanical systems (MEMS).

FIGS. 15 to 17 are views of still another embodiment showing a cellularphone control unit (a main CPU) 110 which controls a wireless charger.

FIG. 15 is a view showing an embodiment of a case in which a controlunit 10 for controlling the wireless charger is provided and a centralprocessing unit (main CPU) 110 of a cellular phone controls the controlunit 10.

FIG. 16 is a view showing a block diagram of an embodiment in which thecellular phone control unit 110 and the wireless charger control unit 10exchange information with each other.

If the wireless charger control unit 10 receives power energy, ittransmits a receiving state to the cellular phone control unit 110(steps 120 and 122). Then, an antenna coil appropriate to a chargingmethod is selected, and voltage or power is converted considering ananalysis value (refer to the above descriptions) (step 128).

Then, information on the selection method is also transmitted to thecellular phone control unit (step 130).

At this point, step 122 does not necessarily need to precede step 124.It may follow step 124 or 128.

FIG. 17 is a view showing an embodiment of a method of controllingwireless charge through a screen of a cellular phone.

If wireless charge is selected at a cellular phone (or a screen of aportable terminal), a screen 74 of the embodiment described above may bedisplayed, and a date 71 is displayed and a charge history may bestored. In addition, start and stop 72 of wireless charge may beselected, and a charging method 73 may be selected and displayed.

There is provided a reception unit for a wireless charging system, inwhich whether or not a wireless charger and an NFC are used is displayedon the display screen of a portable terminal.

Meanwhile, it is apparent that the control as shown in FIG. 17 may beapplied to all the cases of the embodiments mentioned in the abovefigures.

Embodiment 5

FIGS. 18 to 23 are views showing embodiments of providing a receptionunit on the surface of a battery.

FIG. 18 is a view showing an antenna loop coil 50 and a part unit 55 ofthe reception unit mounted on the surface of a battery 70, and it has astructure in which the area of the antenna loop coil 50 and the partunit 55 of the reception unit is not wider than the surface of thebattery. In addition, the part unit 55 is a view showing parts of thereception unit provided on one substrate or on a substrate of the samelayer and mounted on the surface of the battery.

FIG. 19 is a view showing a state of the part unit 55 and the loop coil50 connected using a flexible connection line 57 so as to be bent toeach other. At this point, the flexible connection line 57 is aconnection line made in a method the same as that of a general flexibleprinted circuit (FPC), which is manufactured by printing a conductiveline on a flexible resin substrate. Of course, it does not necessarilyneed to use the FPC, but if two parts can be connected using a flexibleconnection line, it is apparent that this may be applied to the presentinvention.

Here, an external connection terminal 56 is also provided, and theexternal connection terminal 56 is a terminal for electricallyconnecting the battery to a cellular phone or an electronic device. Atthis point, the terminal 56 is provided on the top surface of the partunit substrate 55.

FIG. 20 is a view showing a state of the part unit substrate 55 and theloop coil substrate 50 bent by the flexible connection line 57. As shownin the figure, the external connection terminal 56 is provided on thetop of the part unit substrate 55 in order to provide a structure forconnecting to outside when the part unit substrate 55 is bent. In thismanner, the loop coil substrate 50 is attached to the surface of thebattery 70, and the part unit substrate 55 is attached to the sidesurface of the battery 70.

Meanwhile, FIGS. 21 and 22 are views showing the principle of mountingthe part unit substrate 55 on the side surface of the battery 70. Thatis, the parts mounted on the part unit substrate 55 are formed toprotrude as shown in FIG. 14, and depressions 70 a for placing the partsare provided on the side surface of the battery 70 so that the protrudedparts 55 a may be attached on the side surface of the battery 70. Aseparate plastic structure is used to provide the depressions on theside surface of the battery 70. That is, the depressions are not formedon the side surface of the battery 70, but the separate plasticstructure formed with the depressions is attached to the side surface ofthe battery 70.

Meanwhile, FIG. 22 is a view showing an embodiment of attaching the partunit substrate 55 on three side surfaces, rather than attaching the partunit substrate 55 on one side surface as shown in FIG. 21. That is, thepart unit substrate 55 may be attached on one side surface or on two orthree side surfaces, and, apparently, it may be attached on four sidesurfaces in some cases.

In addition, it is configured such that the parts 55 a are not shownwhen the part unit substrate 55 is attached on the side surface of thebattery 70 as shown in FIG. 20 and the parts 55 a are shown when thepart unit substrate 55 is detached from the side surface of the battery70 as shown in FIG. 21 or 22. To this end, the parts 55 a are formed onthe inner surface of the part unit substrate 55 from the viewpoint ofattaching the part unit substrate 55 on the side surface of the battery70.

FIG. 23 is a view showing a domain where the antenna loop coil 52 isformed on the surface of the battery. Generally, the battery 70 is notan exact rectangular shape, and the loop coil 52 is not a rectangularshape furthermore.

However, although the battery is not a rectangular shape, therectangular shape can be formed using connection lines on the four sidesof the battery, and the rectangular shape of the loop coil 52 can beformed by connecting the outermost parts of the loop coil 52. Althoughonly one loop coil 52 is shown in FIG. 23, it is apparent that otherloop coils 51 and 53 may be formed. That is, although a plurality ofcoils is used, a rectangular shape can be made by connecting theoutermost parts. Then, a domain where a coil is formed may be expressed.

If it is assumed that two sides of the rectangle of the battery arerespectively BS1 and BS2 and two sides of the rectangle of the loop coilare respectively BS1-1 and BS2-1, a ratio of the sides may beconsidered. If the area of the loop coil formed on the surface of thebattery 70 is too small, the magnetic field area of the wireless poweris also decreased, and thus the charging efficiency is lowered as much.Accordingly, it is apparent that the area of the loop coil should belarger than a predetermined area. In addition, if the loop coils 51, 52and 53 are formed on the surface of the battery so as to be seen withnaked eyes, an effect from the viewpoint of design should be considered.

In addition, a ratio of one side of the rectangle of the battery to oneside of the rectangle of the loop coil may be considered taking intoaccount these points, and since a ratio of 70% may be appropriate, thefollowing relation may be established.(BS1-1)/(BS1)>0.7(BS2-1)/(BS2)>0.7

In addition, if the part unit substrate 55 is also formed on the surfaceof the battery 70 as shown in the embodiment of FIG. 18, the areaoccupied by the coil is relatively decreased, and thus the followingrelation may be considered.(BS1-1)/(BS1)>0.6

At this point, although the maximum value of the ratio may be 1.0, theratio may be about 0.99 so that the battery and the coil loop may havealmost the same size.

In addition, if it is assumed that the ratio is 0.7, the area of theloop coil domain may be 49% or more of the area of the rectangle of thebattery. However, since the actual shape of the loop coil may be acircular shape or a rectangular shape including curved lines and theinner side of the coil may be empty, the area of the pure loop coil mustbe much smaller. That is, the actual area of the loop coil may be only20 to 80% of the area of the domain.

Meanwhile, the antenna loop coils 51, 52 and 53 may be directly attachedon the surface of the battery without using a separate antenna loop coilsubstrate 50. In this case, the antenna loop coils 51, 52 and 53 may beattached on the surface of the battery using a tape or the like. Inaddition, it is apparent that the antenna loop coils 51, 52 and 53 maybe attached on the surface of the battery 70 using a film of a sizecapable of covering all the antenna loop coils 51, 52 and 53. At thispoint, an adhesive may be coated on the film, or the film may beattached using a tape.

Embodiment 6

FIGS. 24 to 27 are views showing an embodiment of attaching a receptionunit on the side surface of a battery travel charger.

FIG. 24 is a view showing a state of a closed battery travel charger 80,and FIG. 25 is a view showing a state of an opened battery travelcharger 80. In addition, it is shown that the loop coil substrate 50 ofthe transmission unit is attached on the bottom of the lower case.

At this point, FIG. 25 is a view showing that the loop coil substrate 50of the transmission unit is attached, and the actual position seen fromthe cross section is shown in FIG. 26. It is preferable that the loopcoil substrate 50 is positioned as low as possible, and accordingly, theloop coil substrate 50 is provided at a position lowest possible asshown in FIG. 26.

That is, it may be configured such that the loop coil substrate 50 isattached on the bottom surface of the lower case 82 and a lower cover 83a covers the loop coil substrate 50 as shown in Part (A) of FIG. 26, orthe loop coil substrate 50 may be attached from outside of the lowercase 82 as shown in Part (B) of FIG. 26. Meanwhile, although the part 55a of the transmission unit may be mounted in a space separately preparedinside the case, it is apparent that efficiency of the space may beenhanced by configuring a groove space 82 b on the lower case 82 andmounting the part 55 a in the groove space 82 b.

FIG. 27 is a view showing a ratio of a domain occupied by the loop coilin the battery travel charger.

That is, FIG. 27 is a view showing a domain where the antenna loop coil52 is formed on the surface of the battery travel charger 80. Generally,the battery travel charger 80 is also not an exact rectangular shape,and the loop coil 52 is not a rectangular shape furthermore.

However, a rectangular shape can be formed using connection lines on thefour sides of the battery travel charger 80, and a rectangular shape ofthe loop coil 52 can be formed by connecting the outermost parts of theloop coil 52. Although only one loop coil 52 is shown in FIG. 27, it isapparent that other loop coils 51 and 53 may be formed. That is,although a plurality of coils is used, a rectangular shape can be madeby connecting the outermost parts. Then, a domain where a coil is formedmay be expressed.

If it is assumed that two sides of the rectangle of the battery travelcharger 80 are respectively TS1 and TS2 and two sides of the rectangleof the loop coil are respectively TS1-1 and TS2-1, a ratio of the sidesmay be considered. If the area of the loop coil formed on the surface ofthe battery travel charger 80 is too small, the magnetic field area ofthe wireless power is also decreased, and thus the charging efficiencyis lowered as much. Accordingly, it is apparent that the area of theloop coil should be larger than a predetermined area. In addition, ifthe loop coils 51, 52 and 53 are formed on the surface of the battery soas to be seen with naked eyes, an effect from the viewpoint of designshould be considered.

In addition, a ratio of one side of the rectangle of the battery travelcharger to one side of the rectangle of the loop coil may be consideredtaking into account these points, and since a ratio of 70% may beappropriate, the following relation may be established.(TS1-1)/(TS1)>0.7(TS2-1)/(TS2)>0.7

At this point, although the ratio may be 1.0, it may be about 0.99 sothat the battery travel charger and the coil loop may have almost thesame size.

In addition, the area of the pure loop coil must be much smaller, andthe actual area of the loop coil may be only 20 to 80% of the area ofthe domain.

Meanwhile, although the coil 52 for receiving wireless power energy andthe NFC coil 51 may be formed in one piece in the present invention, itis shown that they may not be formed in one piece. That is, only thewireless power reception coil 52 may be provided, or the wireless powerreception coil 52 and the NFC coil 51 may be provided together.

Or, in the receiver for a wireless charging system, when the coils areprovided on the battery, the area where the coils are provided is 40 to90% of the area of the battery surface.

Embodiment 7

FIGS. 28 to 31 are views showing embodiments of forming a loop coilinside a case of a device.

In this embodiment, the device may be a portable terminal, a cellularphone, or other electronic devices. At this point, other devices aredevices using a battery charged by receiving wireless power energy.

FIG. 28 is a view showing an embodiment of a method of attaching a loopcoil 52 on a lower case 61 and attaching a film 62 or the like on theloop coil 52. At this point, since the loop coil 52 is merely a symbolicnotation, it is apparent that the loop coil 52 may be two or more loopcoils 51, 52 and 53 or a substrate on which the loop coil is formed.

In the same way, the film 60 is also merely a symbolic notation, and itmay be regarded as a fixing means for attaching the loop coil 52 or thesubstrate 50 to the lower case 61. That is, the film 62 may be fixed tothe lower case 61 by coating an adhesive on the film 62, or the film maybe fixed to the lower case using a tape. Apparently, only the tape canbe used instead of the film 62.

In addition, when the loop coil is formed on the substrate 50, a methodof attaching or fixing the substrate 50 to the lower case is used, orthe substrate may be fixed to the lower case 61 as is instead of thefilm 60. At this point, it is apparent that an adhesive, a tape, afixing screw, a fixing pin or the like may be used.

FIG. 29 is a view showing an embodiment of attaching a loop coil 29 (itcan be two or more loop coils or a substrate on which the loop coils areformed) below the lower case 61 and attaching a film 62 below the loopcoil 29. At this point, since the film 62 is exposed to outside of thelower case as is, it is preferable to use a little thicker film 62. Itmay be as thick as a kind of plate, but preferably less than 1 mm. Inaddition, the attaching method is the same as that of the embodiment ofFIG. 21.

FIG. 30 is a view showing an embodiment of forming a loop coil insidethe lower case.

The loop coil 52 (two or more loop coils or a substrate) is expressed asa dotted line in FIG. 30, and this is to express that the loop coil 52is formed inside the lower case.

In order to form the loop coil 52 inside the lower case 61, a method ofinserting the loop coil 52 (in the present invention, it means two ormore loop coils or a substrate) inside a cast and injecting the lowercase is used when the lower case is injected. That is, a method ofinserting a shape of a thin substrate (a loop coil or a substrate onwhich the loop coil is formed may be referred to as a shape of a thinsubstrate) inside a general type case and injecting the lower case maybe used. However, thickness of the lower case is considered at thispoint, and thickness of the loop coil 52 is preferably less than 1 mm soas to easily insert the loop coil inside the cast.

Meanwhile, a means for connecting the inner loop coil and an outercircuit is needed when the loop coil is formed inside the lower case,and a connection terminal 61 a is formed at the lower case 61 for theconnection. At this point, when the lower case is injected, theconnection terminal 61 a may be formed by inserting the connectionterminal 61 a inside the cast while it is connected to the loop coil.

FIG. 31 is a view showing a distance “d” from the bottom to the loopcoil 52 when the loop coil 52 is formed in the lower case 61. Thedistance is determined considering the maximum thickness of the lowercase and the distance between the wireless power energy transmissionunit and the coil of the reception unit. That is, a value of “d” isappropriate to be less than 1.5 mm. However, in the embodiment of FIGS.29 and 30, the “d” value is appropriate to be less than 1.0 mm.

In addition, the “d” value shown in FIG. 31 is a value that can beapplied when the loop coil is mounted on the battery and when the loopcoil is mounted on the battery travel charger.

FIG. 32 is a view showing a domain where a loop coil is formed in alower case.

That is, FIG. 32 is a view showing a domain where the antenna loop coil52 is formed on the surface of the lower case 61. Generally, the lowercase 61 is not an exact rectangular shape, and the loop coil 52 is not arectangular shape furthermore.

However, a rectangular shape can be formed using connection lines on thefour sides of the lower case 61, and a rectangular shape of the loopcoil 52 can be formed by connecting the outermost parts of the loop coil52. Although only one loop coil 52 is shown in this embodiment, it isapparent that other loop coils 51 and 53 may be formed. That is,although a plurality of coils is used, a rectangular shape can be madeby connecting the outermost parts. Then, a domain where a coil is formedmay be expressed.

If it is assumed that two sides of the rectangle of the lower case 61are respectively CS1 and CS2 and two sides of the rectangle of the loopcoil are respectively CS1-1 and CS2-1, a ratio of the sides may beconsidered. If the area of the loop coil formed on the surface of thelower case 61 is too small, the magnetic field area of the wirelesspower is also decreased, and thus the charging efficiency is lowered asmuch. Accordingly, it is apparent that the area of the loop coil shouldbe larger than a predetermined area. In addition, if the loop coils 51,52 and 53 are formed on the surface of the battery so as to be seen withnaked eyes, an effect from the viewpoint of design should be considered.

In addition, a ratio of one side of the rectangle of the lower case toone side of the rectangle of the loop coil may be considered taking intoaccount these points, and since a ratio of 70% may be appropriate, thefollowing relation may be established.(CS1-1)/(CS1)>0.6(CS2-1)/(CS2)>0.7

At this point, although the ratio may be 1.0, it may be about 0.99 sothat the lower case and the coil loop may have almost the same size.

In addition, the actual area of the loop coil may be only 20 to 80% ofthe area of the domain.

Or, when the coils are provided in the lower case, the area where thecoils are provided is 40 to 90% of the area of the case surface.

Embodiment 8

FIGS. 33 to 37 are views showing arrangements of a wireless powerreception coil 52 and an NFC coil 51.

Although the coil 52 for receiving wireless power energy and the NFCcoil 51 may be formed in one piece in the present invention, it is shownthat they may not be formed in one piece.

In the present invention, a part where a wireless power reception coilor an antenna may be placed can be considered. In the present invention,the coil or the antenna may be provided on the battery 70, on thebattery travel charger 80, or on the lower case 61 of a cellular phone.

At this point, forming the coil 52 for receiving wireless power energyand the NFC coil 51 in one piece means that both of the two coils 52 and51 are provided on the battery 70, on the battery travel charger 80 oron the lower case 61 of a cellular phone.

In addition, forming the coils not in one piece means that the coil 52for receiving wireless power energy is provided on the lower case 61 andthe NFC coil 51 is provided on the battery 70, or the coil 52 forreceiving wireless power energy is provided on the battery 70 and theNFC coil 51 is provided on the lower case 61.

That is, in an example other than the example described above, formingthe coils in one piece means that the two coils exist in the same part,and forming the coils not in one piece means that the coils do not existin the same part.

Of course, it is apparent that the coils 51 and 52 may not exist on thebattery or the lower case, but may exist between 61-1 the lower case 61and the parts of the cellular phone in the form of a film.

Then, a considerably large number of cases of forming the coils in onepiece and not in one piece may occur.

That is, although the wireless power reception coil 52 may exist between61-1 the battery 70 and the lower case 61 and the NFC coil may alsoexist between 61-1 the battery 70 and the lower case 61, if the coils donot exist in the same place, they are not formed in one piece.

In addition, forming the coils in one piece means that the coils 51 and52 exist together between 61-1 the battery 70 and the lower case 61.

In addition, it is apparent that when the coils 51 and 52 exist between61-1 the parts of the cellular phone and the lower case, the coils 51and 52 are wrapped with a film or a ferrite sheet.

Meanwhile, it is apparent that although the coil 51 may a coil of onecharging method, the coil may a coil of two or more charging methods(see FIG. 3 of the present invention).

FIG. 33 is a view showing an embodiment of the coils formed not in onepiece.

The domain of the wireless power reception coil 52 and the domain of theNFC coil should not overlap with each other.

That is, a domain CA of the coil 52 is formed at an area where the NFCcoil 51 is not formed in the entire domain NA where the NFC coil 51 isformed. Of course, although some portions of the domains may bepartially overlapped, they should not be overlapped as much as to hindercommunication.

In addition, although an embodiment of providing the NFC coil 51 abovethe coil 52 is shown, the coils should not overlap with each other evenwhen the NFC coil 51 is provided below the coil 52.

In addition, although FIG. 30 is a view showing an embodiment ofproviding the coil 52 inside the domain of the NFC coil 51, it isapparent that although the coil 52 is provided outside the domain of theNFC coil 51, the coils should not overlap with each other.

FIG. 34 is a view showing an embodiment of providing the coil in adomain 61-1 between the part 60 a of a cellular phone and the lower case61. Although it is shown in FIG. 31 that only the wireless powerreception coil 52 is provided, it is apparent that the NFC coil 51 mayalso be provided together in reality.

In addition, providing the coils in the in-between domain 61-1 meansthat the coils 51 and 52 of the present invention are provided not to beattached to the lower case 61 and not to be attached to the part (e.g.,a battery or the like) of the cellular phone.

In addition, the part 60 a of the cellular phone generally means thebattery 70 or other parts. In addition, although the coils 52 and 51 maybe provided on the substrate when the coils are provided in a domain61-1 between the part 60 a of the cellular phone and the lower case 61,it is apparent that the coils 52 and 51 may be provided in a state beingwrapped by an insulation film 55 c. In addition, although it is not showin the figure, a ferrite sheet may be further provided between the coils52 and 51 and the part.

FIG. 35 is a conceptual view showing the cross-sectional positions ofthe coil 52 and the NFC coil 51 when they exist in one piece. It showsthat the wireless power reception coil 52 and the NFC coil 51 may beprovided in one piece in the present invention.

As shown in Part (A) of FIG. 35, the coil 52 and the NFC coil 51 areformed on the same substrate, and the insulation layer 55 a may becoated therebetween. In addition, as shown in Part (B) of FIG. 35, thecoil 52 and the NFC coil 51 may be formed on different substrates 50. Inaddition, it is apparent that a general flexible substrate is used asthe substrates 50.

Meanwhile, a relative ratio of the coil 51 and the NFC coil 51 may bedetermined, and the coil 52 is provided inside the NFC coil 51 in thepresent invention. Accordingly, the length L1 of the NFC coil 51 may bethe thickness of the NFC coil 51 (it is not a vertical thickness, but ahorizontal thickness). On the other hand, L2 denotes a distance of adomain occupied by the coil 52. (That is, although the inner side of thecoil 52 may be empty like a donut shape, the empty portion is alsoincluded in the coil 52.)

In the present invention, the length of L2 is set to be at least two ormore times longer than the length of L1. The reason is to maximizereception of wireless power energy.

In addition, preferably, the coil 52 and the NFC coil 51 are spacedapart from each other by a certain distance (which means a horizontaldistance in the figure). In addition, the spaced distance is preferablybetween 1 to 10 mm. In addition, the most optimum spaced distance ispreferably about 5 mm.

Meanwhile, the coils 51 and 52 do not necessarily need to be provided ona substrate in order to implement the present invention. It means thatthe coils may be attached to each part as they are. However, when thecoils are provided in-between 61-1, it is apparent that the coils 61-1may be provided after being coated with a film or the like.

FIG. 36 is a view showing another embodiment. That is, when a cellularphone is as small as less than five inches, it is general that the coil52 is provided inside the NFC coil 51 as shown in Part (A) of FIG. 36.However, when a cellular phone is as large as ten or seven inches, thecoil 52 may be provided outside the NFC coil 51 in some cases.

FIG. 37 is a view showing still another embodiment of coil arrangement,in which the coil 52 is provided inside the NFC coil 51, and the coil 52is also provided outside the NFC coil 51. That is, the wireless powerreception energy may be maximized by increasing the area and size of thecoil 52.

Embodiment 9

FIGS. 38 to 40 are views showing embodiments describing controls betweenthe coils.

Generally, the NFC coil 51 always maintains an ‘on’ state. Maintainingthe ‘on’ state means that the NFC coil 51 is always connected to amodule which controls the NFC coil 51.

However, if the wireless power reception coil 52 transmits wirelesspower reception energy, the NFC coil maintains an ‘off’ state. At thispoint, maintaining the ‘off’ state means that connection between the NFCcoil 51 and the module which controls the NFC coil 51 is shut down.

FIG. 38 is a block diagram showing an embodiment describing theprinciple of coil control.

The procedure of supplying the portable terminal 60 with power energythat the coil 52 receives is similar to that of the previous embodiment.However, the data received through the NFC coil 51 is transferred to theportable terminal 60 through a separate path.

The reception coil 52 and the NFC coil 51 are provided as shown in thefigure, and the two coils are separated in terms of circuit.Accordingly, a control unit 110 a for controlling the wireless powerreception coil and an NFC module 110 b for controlling the NFC coil 51are separately provided. At this point, separately providing meansseparating the functions, and accordingly, the control unit 110 a andthe NFC module 110 b may be implemented as separate parts, or thefunctions may be distinguished in one part.

Therefore, the exact meaning of separating into two paths is that aconnection line from the coil 52 to the control unit 110 a is separatedfrom a connection line from the NFC coil 51 to the NFC module 110 b.

The NFC module 110 b means an NFC transmission module, and, in addition,the NFC transmission module is configured of an analog interface, an R/Flevel interface and a card mode detector and performs a function oftransmitting data between terminals within a short distance of 10 cm.

Generally, the NFC is a technique of transmitting data between terminalswithin a short distance of 10 cm through a non-contact type near fieldwireless communication module which uses a frequency band of 13.56 MHzas an electronic tag (RFID). The NFC is widely used for transmission ofproduct information by a supermarket or a general store, transmission oftravel information for visitors, information on transportation, anaccess control locking device or the like, as well as being used forpayment.

In addition, there is further provided a switch 18, and the switch mayshut down a connection under the control of the control unit 110 a whichcontrols the coil, and if the connection is shut down by the switch 18,the function of the NFC coil 51 is stopped.

As a result, if the control unit 110 a controls the wireless powerreception coil and the wireless power reception energy is received, thecontrol unit 110 a cuts off the switch to stop the NFC function.

Meanwhile, a method other than the method presented in the presentinvention may be used as a method of stopping the NFC function when thewireless power reception energy is received. The most important thing isthat if the control unit 110 a controls the reception coil 52, a controlcommand for stopping the NFC function is performed.

FIG. 39 is a view showing still another embodiment, and a main CPU 110(a chip which controls the entire cellular phone) existing inside acellular phone 60 controls the wireless power reception coil 52 and theNFC coil 51.

That is, the main CPU 110 of a portable terminal performs the functionsof the control unit 110 a and the NFC module 110 b of FIG. 38. To thisend, a sector capable of performing the functions of the control unit110 a and the NFC module 110 b is provided in the main CPU 110.

FIG. 40 shows that there is provided a cellular phone control unit 110,in addition to the control unit 110 a for controlling a wireless chargecoil and the NFC module 110 b, and the cellular phone control unit 110controls the control unit 110 a and the NFC module 110 b. In addition,when a coil appropriate to a charging method is selected, the controlunit 110 a disconnects or connects the switch 18.

That is, in the present invention, the NFC module for controlling theNFC coil and an MCU for controlling the coil are separately provided,and the main CPU of the cellular phone may control the NFC module andthe MCU. In addition, the main CPU of the cellular phone may directlycontrol the NFC coil and the coil.

Embodiment 10

FIGS. 41 to 44 are views showing embodiments of providing a ferritesheet.

The ferrite sheet may have an insulation effect, and it is a partprovided in the shape of a sheet to minimize the effect of magneticfields between coils or between a coil and a part. Accordingly, theferrite sheet is positioned between the coil and the part of thecellular phone.

Part (A) of FIG. 41 is a top view showing a substrate 55 on which thecoils 52 and 51 are formed.

In addition, Part (B) of FIG. 41 is a view showing an embodiment ofproviding a ferrite sheet 59 on the top of the coils. As shown in thefigure, the ferrite sheet 59 is provided not only on the top of thecoils 52 and 51, but also on a boundary area between the wireless powerreception coil 52 and the NFC coil 51.

Since the ferrite sheet 59 is provided on a boundary area between thecoils 52 and 51, the effect of magnetic fields between the wirelesspower reception coil 52 and the NFC coil 51 is reduced.

At this point, referring to FIG. 41, it is understood that in aconfiguration of cutting a groove into the ferrite, the coils 52 and 51or the like are provided in the groove. That is, it means that an innergroove (space) is formed in a method of etching the surface of theferrite sheet, and a coil may be form in the space. Of course, when theinner groove is formed, a laser processing method or the like may beused.

FIG. 42 is a perspective view showing the ferrite sheet 59 provided onthe coils. As shown in the figure, a projection unit 59 a is formed onthe surface of the ferrite sheet 59 in order to provide the ferritesheet 59 also on the boundary area between the wireless power receptioncoil 52 and the NFC coil 51.

Meanwhile, Parts (A) and (B) of FIG. 41 are a kind of conceptual views,which do not show the actual size as is. That is, thickness of theferrite sheet 59 displayed in Part (A) of FIG. 41 generally does notexceed 1 mm, and the thickness does not exceed 2 mm in maximum in mostcases. In the same way, thickness of the coil may be less than 0.5 mmand does not exceed 2 mm in most cases however thick it may be.

FIG. 43 is a view of an embodiment of providing a different kind offerrite sheet in each domain.

As shown in FIG. 43, different kinds of ferrite sheets may be used for aferrite sheet 59-1 for covering the wireless power reception coil 52, aferrite sheet 59-2 for covering the NFC coil 51, and a ferrite sheet59-3 existing at the boundary area between the coils 52 and 51. That is,in an embodiment of the present invention, it is shows that threedifferent kinds of ferrite sheets 59-1, 59-2 and 59-3 are used.

Electrical characteristics of the wireless power reception coil 52 andthe NFC coil 51 are different from each other, and accordingly,different ferrite sheets 59-1 and 59-2 are used accordingly. Inaddition, since the electrical characteristic of the boundary areabetween the coils is different from those of the coils 52 and 51,another different ferrite sheet 59-3 is used.

FIG. 44 is a view showing still another embodiment of mounting a ferritesheet. As shown in the figure, a part of the substrate 55 in a domainwhere a coil does not exist is removed, and the ferrite sheet existseven in the removed domain.

In this case, a flexible material may be used for the ferrite sheet 59.Actually, a cellular phone is designed to tightly attach the lower case61 and the parts and have almost no empty space. Accordingly, when theferrite sheet 59 is mounted on the coil, it is press fitted.

At this point, if the ferrite sheet 59 is manufactured using an elasticand flexible material to be further thicker than the thickness T (athickness fit to a space actually given between the lower case and theparts) shown in the figure, the ferrite sheet is press fitted and fillsin the area where the substrate 55 is removed (the portion marked with Din the figure).

Then, although a silicon steel plate is used as the ferrite sheet,existing commercialized materials, such as manganese, zinc, ferrite,permalloy, permandur, metal glass, powder steel and the like, may beused. In addition, the zinc or the like may be used in the form of anabsorber. In addition, manganese oxide, zinc oxide, iron oxide or thelike may be used.

Of course, it is apparent that the ferrite sheet 59 may be manufacturedfrom the beginning in a shape of being provided in the area 55 where thesubstrate is removed.

FIG. 45 is a view showing an embodiment of a structure in which coilsare directly formed on the ferrite sheet.

Generally, the coils 52 and 51 are manufactured to be very thin in theform of a film in many cases, and in this case, the coils 52 and 51 maybe directly formed on the surface of the ferrite sheet without making agroove on the ferrite sheet. That is, FIG. 45 is a view showing aferrite sheet formed in the shape of a film.

Since the ferrite sheet, the coil and the NFC coil are manufactured as afilm according to the structure described above and attached to thebattery or the case as one set, marketability of the reception unit maybe further enhanced.

Embodiment 11

FIGS. 46 to 49 are views showing other embodiments of providing coils.

FIG. 46 is a view showing an embodiment of providing an NFC coil in azone separated from those of wireless charging coils 52 and 53. That is,although the NFC coil is provided such that the wireless charging coils52 and 53 are wound inside or outside the NFC coil, this is a figureshowing that the NFC coil is provided in a completely separated zone.

FIG. 47 is a view of an embodiment showing cross-sectional positions.This is a view showing that although the NFC coil and the wirelesscharging coils 52 and 53 are respectively provided in separated zones,they are provided at an upper portion of the lower case 61 of a cellularphone. Of course, it is apparent that they may be provided in the middleor at a lower portion of the lower case 61.

FIGS. 48 and 49 are views showing embodiments of providing the coils atdifferent positions.

That is, FIG. 48 shows an embodiment of providing the NFC coil in acellular phone (or a portable terminal) 60 and the wireless chargingcoils 52 and 53 on the surface of the battery 70, and FIG. 49 shows anembodiment of providing the wireless charging coils 52 and 53 in acellular phone (or a portable terminal) 60 and the NFC coil on thesurface of the battery 70.

At this point, providing the coils in a cellular phone 60 means that thecoils may be provided in the lower case 61 or provided in the form of afilm between the lower case and the parts of the cellular phone.

INDUSTRIAL APPLICABILITY

According to the present invention, since the shape of a coil in thereception unit is effectively designed in a wireless power system and,additionally, a structure capable of enhancing efficiency of magneticfields of the reception unit is provided, it is possible to provide areception unit for a wireless power system which can selectively receivewireless power according to the state of a wireless power transmissionunit and obtain an effect of enhancing reception efficiency.

What is claimed is:
 1. A cellular phone having a lower case, an uppercase, a battery, a controller, a near field communication (NFC) module,a circuit for communication, and a receiver which receives a wirelesscharging energy, and charges the battery using the wireless chargingenergy, the receiver comprising: an NFC coil; a wireless charging coilwhich receives the wireless charging energy and is provided in an insidespace surrounded by the NFC coil; and a magnetic field insulating sheetwhich couples with both the NFC coil and the wireless charging coil,wherein the controller is connected to the wireless charging coilthrough a first connection line and the NFC module is connected to theNFC coil through a second connection line, and wherein the firstconnection line and the second connection line are electricallyseparated from each other, and are connected to the controller and tothe NFC module respectively.
 2. The cellular phone according to claim 1,wherein the NFC coil and the wireless charging coil are formed in aflexible PCB.
 3. The cellular phone according to claim 1, wherein themagnetic field insulating sheet is disposed between the lower case and apart including the battery, the controller, and the circuit, within thecellular phone.
 4. The cellular phone according to claim 3, wherein themagnetic field insulating sheet is unattached to either the lower caseor the part.
 5. The cellular phone according to claim 1, wherein thereceiver further comprises an insulation film which wraps the wirelesscharging coil and the NFC coil.
 6. The cellular phone according to claim1, wherein the magnetic field insulating sheet, the wireless chargingcoil, and the NFC coil, are provided as one set.
 7. The cellular phoneaccording to claim 1, wherein the magnetic field insulating sheetcomprises a silicon steel.
 8. The cellular phone according to claim 1,wherein at least part of the wireless charging coil and at least part ofthe NFC coil are spaced apart from each other by a distance of between 1millimeter and 10 millimeters.
 9. The cellular phone according to claim1, wherein the NFC coil is inactive while the wireless charging coil isactive.
 10. A wireless charging receiver having a wireless charging coilcapable of receiving a wireless charging energy from an externalwireless power transmitter, the wireless charging receiver comprising: amagnetic field insulating sheet; and a near field communication (NFC)coil coupled with the magnetic field insulating sheet, wherein thewireless charging coil is provided in an inside space surrounded by theNFC coil and spaced apart from the NFC coil in a mutually insulatedstate, wherein a first circuit path for receiving data through the NFCcoil and a second circuit path for receiving the wireless chargingenergy through the wireless charging coil are mutually insulated, andwherein the magnetic field insulating sheet, the NFC coil, and thewireless charging coil, are combined into a set and the set is providedin a portable device.
 11. The wireless charging receiver according toclaim 10, wherein the wireless charging coil and the NFC coil arepartially overlapped.
 12. The wireless charging receiver according toclaim 10, wherein the NFC coil and the wireless charging coil are formedin a flexible PCB.
 13. The wireless charging receiver according to claim10, wherein the magnetic field insulating sheet is disposed between alower case of the portable device and a part including a rechargeablebattery, a controller, and a circuit for communication, of the portabledevice.
 14. The wireless charging receiver according to claim 13,wherein the magnetic field insulating sheet is unattached to either thelower case or the part.
 15. The wireless charging receiver according toclaim 10, wherein the wireless charging receiver further comprises aninsulation film which wraps the wireless charging coil and the NFC coil.16. The wireless charging receiver according to claim 10, wherein themagnetic field insulating sheet comprises a silicon steel.
 17. Thewireless charging receiver according to claim 10, wherein at least partof the wireless charging coil and at least part of the NFC coil arespaced apart from each other by a distance of between 1 millimeter and10 millimeters.
 18. The wireless charging receiver according to claim10, wherein the NFC coil is controlled to be inactive if the wirelesscharging coil is determined to be active.